body, html {
  height: 100%;
  margin: 0;
  font-family: Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

.bg-image {
  /* Full height */
  height: 50%;

  /* Center and scale the image nicely */
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* Images used */
.img1 { background-image: url("https://images.unsplash.com/photo-1507525428034-b723cf961d3e?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1353&q=80"); }
.img2 { background-image: url("https://images.unsplash.com/photo-1498747946579-bde604cb8f44?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1489&q=80"); }
.img3 { background-image: url("https://images.unsplash.com/photo-1519229560282-5c6d4a11e474?ixlib=rb-1.2.1&auto=format&fit=crop&w=1349&q=80"); }
.img4 { background-image: url("https://images.unsplash.com/photo-1500993855538-c6a99f437aa7?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80"); }
.img5 { background-image: url("https://images.unsplash.com/photo-1448375240586-882707db888b?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80"); }
.img6 { background-image: url("https://images.unsplash.com/photo-1457528877294-b48235bdaa68?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80"); }

/* Position text in the middle of the page/image */
.bg-text {
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0, 0.4); /* Black w/opacity/see-through */
  color: white;
  font-weight: bold;
  font-size: 80px;
  border: 10px solid #f1f1f1;
  position: fixed; /* Stay fixed */
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  width: 600px;
  padding: 20px;
  text-align: center;
}